﻿<p><em>IfcExternallyDefinedSurfaceStyle</em> is a definition of a surface style through referencing an external source, such as a material library for rendering information.</p>

<blockquote class="note">
NOTE&nbsp; In order to achieve expected results, the externally defined surface style should normally only be given in addition to an explicitly defined surface styles.
</blockquote>

<blockquote class="history">
HISTORY&nbsp; New entity in IFC2x2.
</blockquote>

<blockquote class="change-ifc2x3">
IFC2x3 CHANGE &nbsp;The spelling has been corrected from IfcExternallyDefinedSufaceStyle with no upward compatibility.
</blockquote> 